Improved caster for furniture



NITED STATES PATENT OFFICE.

FREDERIC G. FORD, OF NEW YORK, N. Y.

IMPROVED CASTER FOR FURNITURE.

Specification forming part of Letters Patent N0. 58,999, dated October 23, 1866.

To all whom it may concern:

Be it known that I` FREDERIC G. FORD, of the city, county, and State et' New York, have invented certain new and useful Improvements in Casters for Cabinet-farm and do hereby declare the following to be a full and exact description of the same, reference being had to the accompanying drawings, and to the tigures and letters marked thereon.

On these drawings, Figure lis a view ot' my improved easter, with a portion of the horn removed in order te show the bearing ot the horn and interior construction of the same, also the inclesed central boss et' the easterplate. Fig. 2 is section view taken through the longitudinal axis of the central screw or lille m a: of Fig. 1.

In these figures similar letters of reference refer to corresponding parts.

One of my improvements consists inthe use of a screw passing up through the horn and center of the plate et' the caster, thereby fastening said parts to each other and te the article to which the caster is attached, and doing away altogether with the attachment of the caster by means et' small nails or screws.

Again, casters of that class te which my iinprovements apply have certain objections, one being the partial dependence upon the central boss of the horn for a bearing, which tends to strain the central screw inserted through this central bess into the wood above lthe plate. rlhis central screw not being pretected by a casing at its thread, it is evident that pressure upon the horn, and from thence to the lower portieri of the shoulder of the screw, .will by degrees loosen the firm hold that the thread ot' the screw first had when inserted into the weed.

My construction of caster enables me te have the central boss of the plate as a steadinient to the shoulder of the screw, while at the same time the whole of the strain of the horn and inclosed caster-roller is received upon the face of the plate; also, the horn is so constructed and positioned with respect to this central bess that it is free from contact therewith,consequently doing away with much friction and making this central bess perform its own proper function merely.

The et'ect here produced upon the caster with respect te its ease of movement and facility for change et' its roller in various directiens is marked.

To enable others to make and use my improved caster, I will proceed to describe its construction and operation.

A is the plate of the caster, having projections er other convenient and known means upon its upper surface, so that when placed against the wood the said plate will remain stationary during the movement of the horn and roller.

Upon the under surface ef this plate is coustructcd a central boss, B, so formed that at that part immediately adjacent to the plate there will lee'a shoulder, b, te keep the horn steady in its bearin g against the plate A. From this point down to the end et' the central bess there is a. taper, so that when the screw is inserted through this central bess and plate the boss will terminate or vanish at that part of the inserted screw where the head and shoulder thereof intersect. The result here is that thc bearing of the horn O will be. all against the plate A; and the screw I) will receive its proper and necessary support from the centrai boss, B, without the pressure ot' the horn thereon, there being let't a space between the interior et' the horn O and the central boss, I, and the head of the screw only being cxpesed, so that when the article ot" furniture te which the caster is attached is raised thc horn is prevented from slipping` away from the plate. The screw l) passes through the horn O, the plate A, and its central boss, B, and into the wood to which the caster is at tached. Y

Vhat I claim as my invention, and desire to secure by Letters Patent, is

l. Combining and arranging the caster by leaving a space between the central boss and horn, se that the horn shall be out et" contact- With the central boss, thereby relieving` the caster of much of its friction, substantiallyas shown and described.

2. The combination, in a caster, et" a central screw and horn with a plate constructed with the bess B, substantially as above shown and described.

3. Constructing and arranging the central boss of the plate with respect te the screw and horn so that the said boss shall support thc screw and not be in Contact with the horn, in the manner and for the purposes substantially as herein set forth.

FREDERIC G. FORD.

Vitnesses:

ANDREW 1. TODD, WM. H. Bisher. 

